o Major bugfixes (directory mirrors):
    - Fix broken DirPort self-checks. Decide to advertise begindir
      support the same way we decide to advertise DirPorts.
      Add additional config options that might change the content of
      a relay's descriptor.
      Avoid checking ORPort reachability when the network is disabled.
      Resolves #18616, bugfix on 0c8e042c30946faa in #12538 in
      0.2.8.1-alpha. Patch by "teor".